for level 3, just pop the yellow lines last by
placing the bubble in the middle column instead of
the top row
it can be helpful to move multiple balls into similar paths, so that all of them reach their goals with the same number of tilts. Also, just go real slow and steady, and most levels are easily doable.
I don't know if it helps everyone, but it really helps me to mute both the sound effects and music so I can concentrate better. Nearly doubled my score on the first try
Sometimes, it can be more beneficial to shoot a different colored bubble at the ones already out there if it helps you make more matches.
I wish the controls were more sensitive, but otherwise, this is one of my favorite games.